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简介\r\n宜人贷分布式跟踪系统，基于[Google Dapper论文](http://bigbully.github.io/Dapper-translation/)实现。\r\n\r\n项目名称“蝉”，取自《名贤集·七言集》“金风未动蝉先觉”，代表我们开发这个系统的初衷和思路，我们希望这套系统能够厘清复杂的业务系统中的调用关系，实现调用路径分析和调用链跟踪，对于业务系统中的性能瓶颈以及异常信息能够做到“先知先觉”，帮助开发人员更快的排查问题。  \r\n\r\n## Cicada运行效果\r\ncicada的核心是调用链，通常来说，一个调用链是指一次业务请求涉及到的所有调用（包括方法调用、Http、SQL、IO...）。每次请求生成一个全局唯一的ID，通过这个ID将在分布在不同系统孤立的埋点数据串联起来，组合成调用链。\r\n\r\ncicada的埋点坐标，为App、Service、Method。App代表当前埋点所在的业务系统名称，通常代表一个RPC服务；Service是埋点所在的接口名；Method为埋点的方法。\r\n\r\ncicada的运行效果截图如下：  \r\n+ App列表视图  \r\n![cicada-dashboard-app.jpg](cicada-docs/static/images/cicada_dashboard_app.jpg)\r\n\r\n+ App下的Service列表视图  \r\n![cicada-dashboard-service.jpg](cicada-docs/static/images/cicada_dashboard_service.jpg)\r\n\r\n+ service下的Method列表视图  \r\n![cicada-dashboard-method.jpg](cicada-docs/static/images/cicada_dashboard_method.jpg)\r\n\r\n+ 统计折线图  \r\n统计项目包括失败率、平均响应时间、最大相应时间、95line、999line等。下图显示平均相应时间的统计折线图。  \r\n![cicada-dashboard-report.jpg](cicada-docs/static/images/cicada_dashboard_report.jpg)\r\n\r\n+ trace调用链视图  \r\n针对每个事件，标注事件属于正常（EVENT）还是异常（EXCEPTION）。同时以柱状的形式展现每一个事件的耗时。\r\n![cicada-dashboard-trace.jpg](cicada-docs/static/images/cicada_dashboard_trace.jpg)  \r\n每行从左到右分别显示：当前调用链事件描述、事件类型、事件耗时（单位ms）。  \r\n事件描述信息较长，一行无法显示，通过鼠标单击可以查看完整的提示信息（图中红色椭圆区域标识）。  \r\n\r\n# 帮助文档  \r\n1. [Cicada客户端使用](cicada-docs/cicada-client-quick-start.md)  \r\n2. [Cicada客户端压测说明](cicada-docs/cicada-client-performance.md)  \r\n3. [Cicada Demo使用说明](cicada-docs/cicada_demo_guide.md)  \r\n4. [Cicada总体设计文档](cicada-docs/cicada_design.md)  \r\n5. [Cicada统计模块设计文档](cicada-docs/cicada_statistic_design.md)  \r\n6. [Cicada部署文档](cicada-docs/cicada_deployment.md)  \r\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2FYirendai%2Fcicada","html_url":"https://awesome.ecosyste.ms/projects/github.com%2FYirendai%2Fcicada","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2FYirendai%2Fcicada/lists"}